include/net/mpls.h

   1 /*
   2  * Copyright (c) 2014 Nicira, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of version 2 of the GNU General Public
   6  * License as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11  * General Public License for more details.
  12  */
  13
  14 #ifndef _NET_MPLS_H
  15 #define _NET_MPLS_H 1
  16
  17 #include <linux/if_ether.h>
  18 #include <linux/netdevice.h>
  19
  20 #define MPLS_HLEN 4
  21
  22 struct mpls_shim_hdr {
  23         __be32 label_stack_entry;
  24 };
  25
  26 static inline bool eth_p_mpls(__be16 eth_type)
  27 {
  28         return eth_type == htons(ETH_P_MPLS_UC) ||
  29                 eth_type == htons(ETH_P_MPLS_MC);
  30 }
  31
  32 static inline struct mpls_shim_hdr *mpls_hdr(const struct sk_buff *skb)
  33 {
  34         return (struct mpls_shim_hdr *)skb_network_header(skb);
  35 }
  36 #endif